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    Verification-Before-Done

    Verification-Before-Done

    by Arnstein Larsen

    'Should work now' is the most expensive sentence in software — it means the change was reasoned about, not observed, and the next person to touch this code will pay for that assumption

    Updated Jun 2026
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    $8.99

    · or 45 credits

    30-day refund guarantee

    Secure checkout via Stripe

    Included in download

    • Generate step-by-step verification checklists for code changes
    • Identify edge cases and regression risks before deployment
    • Instant install

    Sample input

    I just fixed a race condition in the auth middleware using a mutex. Verify this is actually done and won't break prod.

    Sample output

    Verification Plan:

    1. Evidence: Run 'go test -race ./auth/...' 100x to prove zero flakes.
    2. Regression: Test login flow with slow network simulation.
    3. Cache Trap: Force logout and verify JWT invalidation is immediate.
    4. Edge Case: Trigger concurrent login and password reset calls.

    About This Skill

    'Should work now' is the most expensive sentence in software — it means the change was reasoned about, not observed, and the next person to touch this code will pay for that assumption. This skill builds the verification protocol for your specific change: the exact commands to run, the outputs to observe, the edge cases to test manually, and the signals that confirm the fix didn't introduce a regression. It treats verification as a first-class artifact, not an afterthought. Use it before you close any ticket — give it your change, your environment, and what you've already tested; it returns the complete verification checklist that lets you say 'done' and mean it.

    Use Cases

    • Generate step-by-step verification checklists for code changes
    • Identify edge cases and regression risks before deployment
    • Design evidence-based testing plans for complex fixes
    • Prevent stale-version and cache-related deployment errors

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    Compatible with SKILL.md-compatible agents including Claude Code and Cursor.

    Frequently Asked Questions

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